See When the Sun Really Reaches Your Windows

West sun refers to a unit whose main windows face west, so it takes the full force of the afternoon and early evening sun, roughly 2pm to sunset. In Singapore's climate this can make a unit noticeably hotter in the late afternoon and push up air-conditioning costs, so it is a common thing buyers ask about before committing.

The sun position is calculated with standard solar astronomy and matches published Singapore sunrise and sunset tables to within a couple of minutes. Shading comes from OpenStreetMap building outlines and heights around your unit, so neighbouring blocks are taken into account. Building heights in OpenStreetMap are sometimes estimated or missing, and trees, balconies, ledges and window tints are not modelled, so treat the result as a strong guide rather than a guarantee for one specific unit.

After you search your postal code, tap the wall of your block where your windows are on the 3D map. The tool snaps to that wall and reads the exact compass direction it faces from the building outline. Then set your floor. If you are unsure which side your unit is on, your floor plan usually shows a north arrow, or a compass app at the window will tell you.

Higher floors see over more of the surrounding blocks, so they usually get more direct sun, both the pleasant morning kind and the hot afternoon kind. A low floor facing west may be well shaded by the next block, while the same stack 20 floors up takes the full afternoon sun.

Singapore sits just north of the equator, so the sun passes almost overhead but leans slightly north for part of the year and slightly south for the rest. That shift changes which windows catch the low morning and evening sun. The year view shows exactly how much it moves for your unit, month by month.